mst222 Posted March 12, 2009 Share Posted March 12, 2009 how do you know what the strongest intermolecular force present for a compound??? Link to comment Share on other sites More sharing options...
max.yevs Posted March 19, 2009 Share Posted March 19, 2009 (edited) hydrogen bonding in water, pehaps? that is much stronger than london dispersion... if not, probably some other polar attraction... oh sorry misunderstood the question Edited March 19, 2009 by max.yevs misunderstood the question Link to comment Share on other sites More sharing options...
CaptainPanic Posted March 19, 2009 Share Posted March 19, 2009 You will have to measure it, model it, discuss it and then accept that there is still a (small) error. Intermolecular forces are hard to measure. Because there exist so many chemicals in the world, there is a big chance that there is no data from measurements. I believe that models such as the UNIFAC model... UNIFAC models interactions from group contributions. Did that answer the question? Please post a more detailed question if you want to know more. Link to comment Share on other sites More sharing options...
Kaeroll Posted March 19, 2009 Share Posted March 19, 2009 Qualitatively for many compounds, IM forces can be guessed by considering the polarity of, and groups present in, the compound. Compounds with amine, hydroxyl or carboxyl groups tend to hydrogen bond, whereas entirely non-polar compounds may have only dispersion forces. Quantifying it is, as the Cap'n said, is a more complicated issue but well worth pursuing. Link to comment Share on other sites More sharing options...
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